Choose the letter for the real motion of space from the list below that is responsible for the apparent motion of space as seen
from Earth (described below).
A. Earth rotates once each day.
B. Earth revolves around the Sun once each year.
C. The direction of Earth's axis in space precesses with a period of 26,000 years.
D. Stars appear to move randomly in the local solar neighborhood.
E. The universe is expanding. The stars of Orion's belt rise in the east and set in the west.
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